(The teacher was suspended and later resigned.)Р”Р„nd the kids say it happens at home too, and we parents almost never know. Their classmates watched, but the teacher didn't see them. Students told us that some kids are having sex in school bathrooms and hallways - even in classrooms.Р”Р„t a middle school outside Baltimore, Md., a couple of 12-year-olds had oral sex in their science class. Still, that's about half the kids, and more are having oral sex.Р”Р„nya said, 'There's one girl at our football games that like gave oral sex to five different football players.'

This week's Newsweek highlights a government report that says the percentage of high school kids having sex dropped this past decade to 46 percent. At this age, you don't know what you're doing with it,' Pamela said. But now that Anya's a teenager, her mother, Pamela, is worried about her.

She's a good student and an accomplished golfer who has won some junior tournaments. 'When I was 5,' Anya said, 'it was like, 'Should I give him a toy or not? Now, it's should I smoke weed? Should I have sex? Should I lie to my parents?'Р”Р„nya responded to a posting on our Web site seeking people concerned about the pressures middle school kids are facing when it comes to sex. In it, she describes her transition from childhood to adolescence. Anya Alvarez, a 13-year-old girl from Tulsa, Okla., agreed to record a video diary for 20/20.

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